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Question (11)

QN0036182

11 Which pair represents contrasting characters studied by Mendel?

(A) Round and wrinkled seeds
(B) Large and small roots only
(C) Red and blue stems
(D) Long and short leaves only

Correct Answer: A

Explanation:

Mendel studied contrasting characters such as round and wrinkled seeds.

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Question (12)

QN0036183

12 Mendel crossed tall pea plants with short pea plants. What was observed in the first-generation progeny?

(A) All were short
(B) All were tall
(C) Half were tall and half were short
(D) All had medium height

Correct Answer: B

Explanation:

All plants in the F1 generation were tall.

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Question (13)

QN0036184

13 Why was the absence of medium-height plants in the F1 generation important?

(A) It showed that traits were blended
(B) It showed that one parental trait was expressed rather than producing an intermediate form
(C) It showed that no genes were present
(D) It showed that all traits were recessive

Correct Answer: B

Explanation:

Mendel observed no halfway characteristic; only one parental trait was expressed.

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Question (14)

QN0036185

14 When F1 tall pea plants were self-pollinated, what fraction of the F2 generation was short?

(A) One-half
(B) One-third
(C) One-quarter
(D) All

Correct Answer: C

Explanation:

One quarter of the F2 progeny were short.

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Question (15)

QN0036186

15 The F2 generation showed that

(A) only tallness was inherited
(B) both tallness and shortness were inherited
(C) shortness did not exist in F1
(D) traits disappear after one generation

Correct Answer: B

Explanation:

The appearance of short plants in F2 showed that the shortness trait had also been inherited by F1 plants.

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Question (16)

QN0036187

16 What did Mendel propose about the factors controlling traits?

(A) There is only one copy of each factor
(B) Two copies of factors are present in sexually reproducing organisms
(C) Factors are found only in the environment
(D) Factors occur only in reproductive organs

Correct Answer: B

Explanation:

Mendel proposed that two copies of factors, now called genes, control traits.

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Question (17)

QN0036188

17 If a pea plant has the genetic combination TT, it will show

(A) shortness
(B) tallness
(C) both tallness and shortness equally
(D) neither trait

Correct Answer: B

Explanation:

Both TT and Tt plants are tall.

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Question (18)

QN0036189

18 If a pea plant has the genetic combination tt, it will be

(A) tall
(B) short
(C) medium-height
(D) unable to reproduce

Correct Answer: B

Explanation:

Both copies must be t for the short trait to be expressed.

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Question (19)

QN0036190

19 A trait that is expressed even when only one copy of the controlling factor is present is called

(A) recessive
(B) dominant
(C) acquired
(D) environmental

Correct Answer: B

Explanation:

A dominant trait is expressed when one copy of the factor is sufficient.

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Question (20)

QN0036191

20 A trait that is expressed only when both copies are recessive is called

(A) dominant
(B) recessive
(C) acquired
(D) environmental

Correct Answer: B

Explanation:

The recessive trait is expressed when both copies are recessive.

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Question (11)

11 Which pair represents contrasting characters studied by Mendel?

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Question (12)

12 Mendel crossed tall pea plants with short pea plants. What was observed in the first-generation progeny?

Explanation:

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Question (13)

13 Why was the absence of medium-height plants in the F1 generation important?

Explanation:

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Question (14)

14 When F1 tall pea plants were self-pollinated, what fraction of the F2 generation was short?

Explanation:

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Question (15)

15 The F2 generation showed that

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Question (16)

16 What did Mendel propose about the factors controlling traits?

Explanation:

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Question (17)

17 If a pea plant has the genetic combination TT, it will show

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Question (18)

18 If a pea plant has the genetic combination tt, it will be

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Question (19)

19 A trait that is expressed even when only one copy of the controlling factor is present is called

Explanation:

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Question (20)

20 A trait that is expressed only when both copies are recessive is called

Explanation:

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